Introduction
Here is how to replace the rechargeable battery in the Phillips SoniCare FlexCare. This is a difficult repair, be careful. If you see a swollen battery, follow the instructions here: What to do with a swollen battery.
What you need
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Push the flat edge of a metal or nylon spudger between the seal and the toothbrush body and pry it open. Do this all around the edge until the seal is partially sticking out.
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Apply pressure to the shaft by pressing it against a firm and flat surface. Continue to apply pressure until the electronics located in the interior are exposed.
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Remove the cap that is attached to the end of the interior by removing the two clasps that are holding it in place.
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Desolder the battery from the circuit board. Here is a guide on how to desolder. Remove the old battery and replace it. Using the same guide, solder the battery in place.
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The soldering points are shown in red.
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